<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>03.圆角</title>
    <style>
        div {
            width: 300px;
            height: 50px;
            border: 10px solid;
            background-color: red;
            border-radius:35px; 
            /* 设置圆角 */
            /* border-radius:150px 150px 150px 150px; */
            /* border-radius:150px; */
        }
    </style>
</head>
<body>

    <div></div>
    
</body>
</html>